1920 U.S. National Championships – Men's singles
# 1920 U.S. National Championships – Men's singles

Bill Tilden defeated Bill Johnston in the final, 6–1, 1–6, 7–5, 5–7, 6–3 to win the men's singles tennis title at the 1920 U.S. National Championships. It was Tilden's first U.S. Championships singles title, the first of an eventual record seven such titles, and his second major singles title overall.

## Draw

### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Final eight

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final | Final |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| George Colket Caner | 6 | 6 | 6 | | | | | | | | | | | | |
| Irving Wright | 3 | 4 | 2 | | | | | | | | | | | | |
| Irving Wright | 3 | 4 | 2 | | George Colket Caner | 3 | 6 | 6 | 4 | | | | | | |
| | | | | | Bill Johnston | 6 | 4 | 8 | 8 | | | | | | |
| Watson Washburn | 4 | 4 | 5 | | Bill Johnston | 6 | 4 | 8 | 8 | | | | | | |
| Bill Johnston | 6 | 6 | 7 | | | | | | | | | | | | |
| Bill Johnston | 6 | 6 | 7 | | | | | | | Bill Johnston | 1 | 6 | 5 | 7 | 3 |
| | | | | | | | | | | Bill Tilden | 6 | 1 | 7 | 5 | 6 |
| Clarence Griffin | 1 | 3 | 6 | 4 | | | | | | | | | | | | Bill Tilden | 6 | 1 | 7 | 5 | 6 |
| Wallace Johnson | 6 | 6 | 2 | 6 | | | | | | | | | | | |
| Wallace Johnson | 6 | 6 | 2 | 6 | Wallace Johnson | 12 | 4 | 4 | | | | | | | |
| | | | | | Bill Tilden | 14 | 6 | 6 | | | | | | | |
| Bill Tilden | 6 | 8 | 6 | | Bill Tilden | 14 | 6 | 6 | | | | | | | |
| Walter Wesbrook | 3 | 6 | 1 | | | | | | | | | | | | |
